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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet cylinder/piston/rings installation
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<blockquote data-quote="Tom Gaynor" data-source="post: 14411" data-attributes="member: 4034"><p>Confession time. I use grease on cylinder base gaskets too. Perhaps if they leaked I'd go to Wellseal, but they haven't.</p><p>I always go to considerable lengths to get the two sides of the crankcase top face flat before bolting up, using an oilstone as final proof. This might mean putting head and barrel on, tighterning them down, tightening the crankcase bolts, then taking head and barrel back off to fit piston (an indispensable aid to maximum performance).</p><p>The first thing you need is a flat top face, and the second, a crank that turns SLOWLY with no resistance. Don't tighten up until you have both, and once you HAVE tightened up, check again. This might mean shimming to make sure the rod is in the centre of the bore. </p><p>As Glen Bewley says: "if it's almost right, it's wrong".</p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="Tom Gaynor, post: 14411, member: 4034"] Confession time. I use grease on cylinder base gaskets too. Perhaps if they leaked I'd go to Wellseal, but they haven't. I always go to considerable lengths to get the two sides of the crankcase top face flat before bolting up, using an oilstone as final proof. This might mean putting head and barrel on, tighterning them down, tightening the crankcase bolts, then taking head and barrel back off to fit piston (an indispensable aid to maximum performance). The first thing you need is a flat top face, and the second, a crank that turns SLOWLY with no resistance. Don't tighten up until you have both, and once you HAVE tightened up, check again. This might mean shimming to make sure the rod is in the centre of the bore. As Glen Bewley says: "if it's almost right, it's wrong". Tom [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet cylinder/piston/rings installation
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